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Acer z3751 has mother board problems especially when the operating system is being updated. So far Acer service only replaces its mother board when there is a complaint of auto shut down and of having difficulty in starting the systems. I would advise not to replace the mother board if there is such a problem after warranty period and if possible try to extend the warranty period as long as possible to minimise the cost of repairing.

most likely it is a sound from mother board
- try to reseat the mother board(take out and put it back in)
- then check if still getting a sound/beep
- if not good!
- if yes replacement mother board suggestion

TIP:
- try other mother board on your computer first to check if you can hear a wierd noise

find out the price and then compare... but in my experience... its cheaper to get a new mother board with the chip and then just install it... in the end... all you are really concerned about is the hard drive... becuase thats where your data is...

... and tell me, what is your question. The hard drive doesnt care what the mother board looks like with the following proviso ... you have a IDE drive not ... the new mother board must support it. You have a serial drive, the mother board myst support it.